JPH0676755U - Pulley mounting device - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention enables a pulley to be easily and rotatably mounted on a shaft, and enables stable rotation without impairing the space efficiency in the axial direction. To do. A pulley mounting device according to the present invention has a shaft having a groove portion formed on a peripheral surface thereof and hooks 7 and 8 engaging with the groove portion. This hook is composed of a holding part 5, which is a predetermined distance from the center.
6 and elastically extends toward the periphery of the center.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pulley mounting device, and more particularly to a pulley mounting device that can be easily and rotatably mounted on a shaft.

[0002]

[Prior art]

 Conventionally, as a pulley of this type, as shown in FIG. 5, a plurality of hooks 28 having an elastic effect by axially dividing and extending from the peripheral portion of the center hole of the pulley 27 are provided. There is proposed a type in which the shaft 26 is rotatably held by being fitted into a groove portion 26 formed on the peripheral surface of the shaft.

[0003]

[Problems to be solved by the device]

 In consideration of durability and flexibility, the hook having the above-mentioned shape cannot be shortened in the axial length so much, so that the space efficiency in the axial direction is not so good. Further, when the pulley receives a force in the axial direction indicated by the arrow, the friction between the hook and the shaft increases, and an unreasonable load is applied to the hook portion.

[0004]

[Means for Solving the Problems]

 A shaft having an engaging groove formed on its peripheral surface, and a pulley rotatably held by the shaft, in which a central hole through which the shaft is loosely formed is formed. And a pulley having a hook elastically extending toward a periphery of the central portion from a position distant from the central portion by a predetermined distance on one surface of the side portion.

[0005]

[Action]

 The pulley is attached to the shaft passing through the center hole so that the hook engages with the engaging groove of the shaft, and the movement of the pulley is restricted in the axial direction. It is rotatably held.

[0006]

【Example】

 A front view, a top view and a perspective view of a pulley relating to the device of the present invention are shown in FIGS. 2, 1 and 3, respectively. A groove 2 for mounting a belt is formed on the peripheral surface of the pulley 1, and a central hole 3 is formed in the central portion for the shaft to pass through. A pair of hooks 7 and 8 are integrally held on a top surface portion 4, which is one side surface portion of the pulley 1, in holding portions 5 and 6 which are separated from the center hole 3 by a predetermined distance. The hook 7 is bent at a right angle on the slightly upper surface of the holding portion 5 and extends parallel to the upper surface portion 4, and its tip portion is similarly formed above the center hole 3 of the pulley 1. It is formed so as to face the tip portion of No. 8. Further, the hooks 7 and 8 have elasticity such that the tips thereof can be slightly moved vertically and horizontally with a restoring force.

Further, projections 9 and 10 projecting toward the center are formed at the tips of the hooks 7 and 8, respectively. The protrusion 9 has a tapered shape by an inclined surface 11 (FIG. 2) inclined with respect to the axial direction and an opposed surface 13 (FIG. 1) parallel to the tangential direction of the shaft. The facing surface 13 and the facing surface 14 of the protrusion 10 of the hook 8 formed in the same manner face each other in parallel at a distance h at a position slightly facing the center hole 3 from both sides. Further, on the lower surface portion 15 which is the other side surface portion of the pulley 1, an overhanging portion 16 having an abutting flat surface 17 facing a shaft regulating surface is formed as will be described later.

FIG. 4 shows a state in which the pulley 1 formed as described above is attached to the shaft 18 with its embedded portion 22 fixed to a base (not shown). The diameter D1 of the central portion of the shaft 18 and the inner diameter of the center hole of the pulley 1 are considered so that the pulley is rotatable, and the diameter of the flange portion 20 of the shaft is set to the diameter D1 of the central portion. It Further, the shaft 18 has a groove portion 19 having a diameter D2 which is substantially the same as the distance h between the facing surfaces of the pulley 1 described above, and the restricting surface 23 is in contact with the contact flat surface 17 of the pulley 1 so that the shaft 18 has an axial direction. It has a regulation board 21 for regulating the directional movement.

Explaining the mounting process of the pulley 1, the pulley 1 is brought so that the shaft 18 enters the central hole 3 from the lower surface 15 side thereof. When the pulley 1 is moved in the direction of arrow A in FIG. 4 with respect to the shaft 18, first, the flange portion 20 of the shaft 18 penetrates the center hole 3 of the pulley 1, and eventually the pair of hooks 7 and 8 is released. Abut on the inclined surfaces 11 and 12. When the pulley 1 is further moved in the direction of the arrow A, the flange portion 20 acts on the inclined surfaces 11 and 12 to spread the hooks 7 and 8, and eventually the abutment plane 17 of the pulley 1 is a shaft regulating plate. It is brought to a position where it abuts against the restriction surface 23 of 21. At this time, the flange portion 20 passes through the inclined surface, and the projections 9 and 10 of each hook reach the groove portion 19 of the shaft to be restored to the state shown in FIG.

In this state of FIG. 4, the pulley 1 is rotatably held with its axial movement restricted by the shaft flange portion 20 and the restriction board 21. In the above embodiment, the bottom surfaces of the tips of the hooks 7 and 8 are formed to be separated from the upper surface 4 of the pulley so that the hooks 7 and 8 can be bent in the axial direction. The hook may be formed as a pair, but the number of hooks may be one or three or more. Further, in the embodiment, the restriction board 21 restricts the movement of the pulley in one of the axial directions. However, by considering the engagement relationship between the protrusion of the hook and the groove of the shaft, it may be possible in some cases. Can be deleted.

[0011]

[Effect of device]

 According to the present invention, the pulley can be smoothly mounted on the shaft, and the space efficiency in the axial direction of the device is not significantly impaired. Further, since the bottom surfaces of the tips of the hooks 7 and 8 are formed apart from the upper surface 4 of the pulley as in the embodiment, the axial force applied to the pulley is changed by the elasticity of the hook. It can absorb and prevent the damage of the pulley.

[Brief description of drawings]

FIG. 1 is a top view of a pulley according to an embodiment of the present application.

FIG. 2 is a front view of a pulley according to the present embodiment.

FIG. 3 is a perspective view of a pulley according to an embodiment of the present application.

FIG. 4 is a configuration diagram of an apparatus according to an embodiment of the present application.

FIG. 5 is a configuration diagram of a main part of a conventional device.

[Explanation of symbols]

 1 Pulley 3 Center hole 4 Upper surface part 5 Holding part 6 Holding part 7 Hook 8 Hook 9 Projection part 10 Projection part 16 Overhanging part 18 Shaft 19 Groove part 20 Flange part 21 Restriction board 22 Embedded part

Claims (1)

[Scope of utility model registration request] 1. A shaft having an engaging groove formed on its peripheral surface, and a pulley rotatably held by the shaft, wherein a center hole through which the shaft freely passes is formed. And a pulley having a hook elastically extending toward the periphery of the central portion from a position separated from the central portion by a predetermined distance on one surface of the pair of side surface portions, The pulley is attached to the shaft passing through the hole so that the hook engages with the engaging groove of the shaft.
A pulley mounting device characterized in that the pulley is regulated in its axial movement and is rotatably held.